(5a-20)/(4-a)

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Solution for (5a-20)/(4-a) equation: 


D( a )

4-a = 0

4-a = 0

4-a = 0

4-a = 0 // - 4

-a = -4 // * -1

a = 4

a in (-oo:4) U (4:+oo)

(5*a-20)/(4-a) = 0

5*a-20 = 0 // + 20

5*a = 20 // : 5

a = 20/5

a = 4

a in { 4} 

a belongs to the empty set

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